Crystallization and preliminary crystallographic analysis of the major horse allergen Equ c 1

1999 ◽  
Vol 55 (4) ◽  
pp. 880-882 ◽  
Author(s):  
Christophe Grégoire ◽  
Gisele A. Tavares ◽  
Hans K. Lorenzo ◽  
Jean-Pierre Dandeu ◽  
Bernard David ◽  
...  
Keyword(s):  
Single Molecule ◽  
Gel Filtration ◽  
Specific Ige ◽  
Crystallographic Analysis ◽  
Recombinant Form ◽  
Data Set ◽  
Synchrotron Source ◽  
Cell Parameters ◽  
Low Protein ◽  
Equilibrium Sedimentation

The secreted protein Equ c 1 is the major component responsible for the induction of specific IgE antibodies in patients sensitized to horse allergens. Equ c 1 belongs to the lipocalin superfamily of hydrophobic ligand-binding proteins, which also includes other known allergens. Equilibrium sedimentation and gel-filtration studies demonstrate that both the glycosylated form of Equ c 1 purified from horse salivary glands and the non-glycosylated recombinant form expressed in bacteria exist predominantly as dimers in solution. As observed for other dimeric lipocalins, acidic pH and low protein concentration favour dimer dissociation. The recombinant form of Equ c 1 has been crystallized using ammonium sulfate as a precipitant. The crystals belong to the tetragonal space group P41212 with cell parameters a = b = 84.0, c = 56.1 Å, and contain a single molecule in the asymmetric unit. A complete data set from native crystals was collected at the synchrotron source in Hamburg to 2.9 Å resolution using a frozen crystal, and structure determination is in progress.

scholarly journals Crystallization and preliminary X-ray diffraction analysis of UspE fromEscherichia coli

2014 ◽  
Vol 70 (12) ◽  
pp. 1640-1642 ◽  
Author(s):  
Yongbin Xu ◽  
Chun-Shan Quan ◽  
Xuanzhen Jin ◽  
Xiaoling Jin ◽  
Jing Zhao ◽  
...  
Keyword(s):  
Stress Proteins ◽  
Gel Filtration ◽  
X Ray Diffraction ◽  
Unit Cell Parameters ◽  
Data Set ◽  
X Ray ◽  
Cell Parameters ◽  
E Coli ◽  
Vapour Diffusion ◽  
Induced Genes

Universal stress proteins (Usps) are among the most highly induced genes when bacteria are subjected to several stress conditions such as heat shock, nutrient starvation or the presence of oxidants or other stress agents.Escherichia colihas five small Usps and one tandem-type Usp. UspE (or YdaA) is the tandem-type Usp and consists of two Usp domains arranged in tandem. To date, the structure of UspE remains to be elucidated. To contribute to the molecular understanding of the function of the tandem-type UspE, UspE fromE. coliwas overexpressed and the recombinant protein was purified using Ni–NTA affinity, Q anion-exchange and gel-filtration chromatography. Crystals of UspE were obtained by sitting-drop vapour diffusion. A diffraction data set was collected to a resolution of 3.2 Å from flash-cooled crystals. The crystals belonged to the tetragonal space groupI4122 orI4322, with unit-cell parametersa=b= 121.1,c = 241.7 Å.

scholarly journals YopT domain of the PfhB2 toxin from Pasteurella multocida: protein expression, characterization, crystallization and crystallographic analysis

2018 ◽  
Vol 74 (3) ◽  
pp. 128-134
Author(s):  
Sanjeev Kumar ◽  
Victoria Hedrick ◽  
Seema Mattoo
Keyword(s):  
Pasteurella Multocida ◽  
Opportunistic Infections ◽  
Structural Information ◽  
Sequence Similarity ◽  
Catalytic Triad ◽  
Crystallographic Analysis ◽  
High Sequence Similarity ◽  
Data Set ◽  
Cell Parameters ◽  
Tract Infections

Pasteurella multocida causes respiratory-tract infections in a broad range of animals, as well as opportunistic infections in humans. P. multocida secretes a multidomain toxin called PfhB2, which contains a YopT-like cysteine protease domain at its C-terminus. The YopT domain of PfhB2 contains a well conserved Cys–His–Asp catalytic triad that defines YopT family members, and shares high sequence similarity with the prototype YopT from Yersinia sp. To date, only one crystal structure of a YopT family member has been reported; however, additional structural information is needed to help characterize the varied substrate specificity and enzymatic action of this large protease family. Here, a catalytically inactive C3733S mutant of PfhB2 YopT that provides enhanced protein stability was used with the aim of gaining structural insight into the diversity within the YopT protein family. To this end, the C3733S mutant of PfhB2 YopT has been successfully cloned, overexpressed, purified and crystallized. Diffraction data sets were collected from native crystals to 3.5 Å resolution and a single-wavelength anomalous data set was collected from an iodide-derivative crystal to 3.2 Å resolution. Data pertaining to crystals belonging to space group P31, with unit-cell parameters a = 136.9, b = 136.9, c = 74.7 Å for the native crystals and a = 139.2, b = 139.2, c = 74.7 Å for the iodide-derivative crystals, are discussed.

scholarly journals Production, crystallization and preliminary crystallographic analysis ofAllochromatium vinosumthiosulfate dehydrogenase TsdA, an unusual acidophilicc-type cytochrome

2014 ◽  
Vol 70 (10) ◽  
pp. 1424-1427 ◽  
Author(s):  
José A. Brito ◽  
André Gutierres ◽  
Kevin Denkmann ◽  
Christiane Dahl ◽  
Margarida Archer
Keyword(s):  
Crystallographic Analysis ◽  
Sulfur Cycle ◽  
Monoclinic Space Group ◽  
Asymmetric Unit ◽  
Oxidative Condensation ◽  
Unit Cell Parameters ◽  
Allochromatium Vinosum ◽  
Data Set ◽  
Purple Sulfur Bacterium ◽  
Cell Parameters

The ability to perform the very simple oxidation of two molecules of thiosulfate to tetrathionate is widespread among prokaryotes. Despite the prevalent occurrence of tetrathionate formation and its well documented significance within the sulfur cycle, little is known about the enzymes that catalyze the oxidative condensation of two thiosulfate anions. To fill this gap, the thiosulfate dehydrogenase (TsdA) enzyme from the purple sulfur bacteriumAllochromatium vinosumwas recombinantly expressed inEscherichia coli, purified and crystallized, and a crystallographic data set was collected. The crystals belonged to the monoclinic space groupC2, with unit-cell parametersa= 79.2,b= 69.9,c= 57.9 Å, β = 129.3°, contained one monomer per asymmetric unit and diffracted to a resolution of 1.98 Å.

scholarly journals Expression, purification, crystallization and preliminary X-ray crystallographic analysis of Enpp6

2014 ◽  
Vol 70 (6) ◽  
pp. 794-799 ◽  
Author(s):  
Junko Morita ◽  
Kazuki Kato ◽  
Emiko Mihara ◽  
Ryuichiro Ishitani ◽  
Junichi Takagi ◽  
...  
Keyword(s):  
Catalytic Domain ◽  
Crystallographic Analysis ◽  
X Ray Diffraction ◽  
Unit Cell Parameters ◽  
Data Set ◽  
X Ray ◽  
Cell Parameters ◽  
Choline Metabolism ◽  
Protein Molecules ◽  
Membrane Bound

Enpp (ectonucleotide phosphodiesterase/pyrophosphatase) 6 is a membrane-bound glycoprotein that hydrolyzes choline-containing compounds such as lysophosphatidylcholine and glycerophosphorylcholine, and presumably participates in choline metabolism. The catalytic domain of mouse Enpp6 was expressed in HEK293T cells, purified using the TARGET tag/P20.1-Sepharose system and crystallized. An X-ray diffraction data set was collected to 1.8 Å resolution. The crystal belonged to space groupP1, with unit-cell parametersa= 63.7,b= 68.8,c= 69.7 Å, α = 60.6, β = 87.0, γ = 68.1°. Assuming the presence of two protein molecules per asymmetric unit, the solvent content was estimated to be 49.5%.

scholarly journals Cloning, purification and preliminary crystallographic analysis of theHelicobacter pyloripseudaminic acid biosynthesisN-acetyltransferase PseH

2014 ◽  
Vol 70 (9) ◽  
pp. 1276-1279 ◽  
Author(s):  
Yu C. Liu ◽  
Abu I. Ud-Din ◽  
Anna Roujeinikova
Keyword(s):  
Crystallographic Analysis ◽  
Diffusion Method ◽  
X Ray Diffraction ◽  
Data Set ◽  
Cell Parameters ◽  
Nonulosonic Acid ◽  
Pseudaminic Acid ◽  
The Common ◽  
H Pylori ◽  
Development Of Gastric Cancer

Helicobacter pyloriinfection is the common cause of gastritis and duodenal and stomach ulcers, which have been linked to a higher risk of the development of gastric cancer. The motility that facilitates persistent infection requires functional flagella that are heavily glycosylated with 5,7-diacetamido-3,5,7,9-tetradeoxy-L-glycero-L-manno-nonulosonic acid (pseudaminic acid). Pseudaminic acid biosynthesis protein H (PseH) catalyzes the third step in its biosynthetic pathway, producing UDP-2,4-diacetamido-2,4,6-trideoxy-β-L-altropyranose. Crystals ofH. pyloriPseH have been grown by the hanging-drop vapour-diffusion method using diammonium tartrate as a precipitating agent. The crystals belonged to space groupI222 orI212121, with unit-cell parametersa= 107.8,b= 145.4,c= 166.3 Å. A complete X-ray diffraction data set has been collected to 2.5 Å resolution using cryocooling conditions and synchrotron radiation.

scholarly journals Cloning, expression, purification, crystallization and preliminary crystallographic analysis of the C-terminal domain of Par-4 (PAWR)

2014 ◽  
Vol 70 (9) ◽  
pp. 1224-1227 ◽  
Author(s):  
Udaya Kumar Tiruttani Subhramanyam ◽  
Jan Kubicek ◽  
Ulf B. Eidhoff ◽  
Joerg Labahn
Keyword(s):  
Crystallographic Analysis ◽  
X Ray Diffraction ◽  
Unit Cell Parameters ◽  
Data Set ◽  
X Ray ◽  
Cell Parameters ◽  
Intrinsically Disordered ◽  
Tumour Suppressor Function ◽  
C Terminus ◽  
Apoptotic Protein

Prostate apoptosis response-4 protein is an intrinsically disordered pro-apoptotic protein with tumour suppressor function. Par-4 is known for its selective induction of apoptosis in cancer cells only and its ability to interact with various apoptotic proteinsviaits C-terminus. Par-4, with its unique function and various interacting partners, has gained importance as a potential target for cancer therapy. The C-terminus of the rat homologue of Par-4 was crystallized and a 3.7 Å resolution X-ray diffraction data set was collected. Preliminary data analysis shows the space group to beP41212. The unit-cell parameters area=b= 115.351,c= 123.663 Å, α = β = γ = 90°.

scholarly journals Crystallographic analysis of the Staphylococcus epidermidis lipase involved in esterification in aqueous solution

2018 ◽  
Vol 74 (6) ◽  
pp. 351-354
Author(s):  
Cheng-Huan Liu ◽  
Yu-Ting Chen ◽  
Ming-Hon Hou ◽  
Nien-Jen Hu ◽  
Chin-Shuh Chen ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Molecular Weight ◽  
Staphylococcus Epidermidis ◽  
Crystallographic Analysis ◽  
Asymmetric Unit ◽  
Unit Cell Parameters ◽  
Data Set ◽  
Solvent Content ◽  
Cell Parameters ◽  
Esterification In Aqueous Solution

The Staphylococcus epidermidis lipase (SeLip, GehC) can be used in flavour-compound production via esterification in aqueous solution. This study reports the crystallization and crystallographic analysis of recombinant GehC (rGehC; Lys303–Lys688) with a molecular weight of 43 kDa. rGehC was crystallized at 293 K using PEG 10 000 as a precipitant, and a 99.9% complete native data set was collected from a cooled crystal at 77 K to a resolution of 1.9 Å with an overall R merge value of 7.3%. The crystals were orthorhombic and belonged to space group P212121, with unit-cell parameters a = 42.07, b = 59.31, c = 171.30 Å, α = β = γ = 90°. Solvent-content calculations suggest that there is likely to be one lipase subunit in the asymmetric unit.

scholarly journals Crystallization and preliminary X-ray crystallographic analysis of Pz peptidase B fromGeobacillus collagenovoransMO-1

2012 ◽  
Vol 68 (7) ◽  
pp. 757-759 ◽  
Author(s):  
Hiroaki Nakano ◽  
Allin Hosokawa ◽  
Ryuji Tagawa ◽  
Koji Inaka ◽  
Kazunori Ohta ◽  
...  
Keyword(s):  
Space Station ◽  
Crystallographic Analysis ◽  
Diffusion Method ◽  
Unit Cell Parameters ◽  
Data Set ◽  
Peptide Substrates ◽  
X Ray ◽  
Cell Parameters ◽  
Experiment Module ◽  
Counter Diffusion

Pz peptidase B is an intracellular M3 metallopeptidase that is found together with Pz peptidase A in the thermophileGeobacillus collagenovoransMO-1 and recognizes collagen-specific tripeptide units (-Gly-Pro-X-). These peptidases have low homology in their primary structures; however, their cleavage patterns towards peptide substrates are similar. In this work, Pz peptidase B was crystallized using the counter-diffusion method. Data were collected to a resolution of 1.6 Å at 100 K from a crystal obtained in the Japanese Experiment Module (JEM; also known as `Kibo') at the International Space Station (ISS). The crystal belonged to the trigonal space groupP3121, with unit-cell parametersa=b= 87.64,c= 210.5 Å. A complete data set was also obtained from crystals of selenomethionine-substituted protein.

scholarly journals Expression, purification and preliminary crystallographic analysis of the cryptic polo-box domain ofCaenorhabditis elegansZYG-1

2014 ◽  
Vol 70 (10) ◽  
pp. 1346-1350
Author(s):  
Ekaterina Shimanovskaya ◽  
Gang Dong
Keyword(s):  
Crystallographic Analysis ◽  
Structural Knowledge ◽  
Diffusion Method ◽  
Lysine Methylation ◽  
Wild Type ◽  
Data Set ◽  
Cell Parameters ◽  
Anomalous Data ◽  
Strain Bl21 ◽  
Shed Light

ZYG-1 is a polo-like kinase essential for centriole assembly inCaenorhabditis elegans. The targeting of ZYG-1 to nascent centrioles isviaits central cryptic polo-box (CPB) domain. To shed light on the molecular basis of ZYG-1 recruitment, it is necessary to obtain structural knowledge of the ZYG-1 CPB. Here, the expression, purification and preliminary crystallographic analysis of the ZYG-1 CPB are reported. The protein was overexpressed inEscherichia colistrain BL21 (DE3), purified by multi-step chromatography and crystallized using the vapour-diffusion method. Crystals of the wild-type protein exhibited an order–disorder pathology, which was solved by reductive lysine methylation. A complete anomalous data set was collected to 2.54 Å resolution at the Se Kedge (λ = 0.9792 Å). The crystal belonged to space groupP2, with unit-cell parametersa= 53.3,b= 60.09,c= 87.51 Å, β = 93.31°. There were two molecules in the asymmetric unit.

scholarly journals Cloning, expression, refolding, purification and preliminary crystallographic analysis of the sensory domain of theCampylobacterchemoreceptor for aspartate A (CcaA)

2015 ◽  
Vol 71 (1) ◽  
pp. 110-113 ◽  
Author(s):  
Mayra A. Machuca ◽  
Yu C. Liu ◽  
Anna Roujeinikova
Keyword(s):  
Campylobacter Jejuni ◽  
Inclusion Bodies ◽  
Crystallographic Analysis ◽  
Diffusion Method ◽  
Hanging Drop ◽  
Unit Cell Parameters ◽  
Data Set ◽  
Cell Parameters ◽  
Extracellular Signals ◽  
Denatured Protein

InCampylobacter jejuni, chemotaxis and motility have been identified as important virulence factors that are required for host colonization and invasion. Chemotactic recognition of extracellular signals is mediated by the periplasmic sensory domains of its transducer-like proteins (Tlps). In this study, the sensory domain of theC. jejunichemoreceptor for aspartate A (CcaA) has been expressed inEscherichia coliand purified from inclusion bodies. The urea-denatured protein was refolded and then crystallized by the hanging-drop vapour-diffusion method using PEG 3350 as a precipitating agent. A complete data set has been collected to 1.4 Å resolution using cryocooling conditions and synchrotron radiation. The crystals belonged to space groupP1, with unit-cell parametersa= 39.3,b= 43.3,c= 50.9 Å, α = 92.5, β = 111.4, γ = 114.7°.

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